λ x : word64 * word64 * word64 * word64 * word64,
Interp-η
(λ var : Syntax.base_type → Type,
 λ '(x7, x8, x6, x4, x2)%core,
 uint64_t x9 = x2 * 0x2;
 uint64_t x10 = x4 * 0x2;
 uint64_t x11 = x6 * 0x2 * 0x13;
 uint64_t x12 = x7 * 0x13;
 uint64_t x13 = x12 * 0x2;
 uint128_t x14 = (uint128_t) x2 * x2 + (uint128_t) x13 * x4 + (uint128_t) x11 * x8;
 uint128_t x15 = (uint128_t) x9 * x4 + (uint128_t) x13 * x6 + (uint128_t) x8 * (x8 * 0x13);
 uint128_t x16 = (uint128_t) x9 * x6 + (uint128_t) x4 * x4 + (uint128_t) x13 * x8;
 uint128_t x17 = (uint128_t) x9 * x8 + (uint128_t) x10 * x6 + (uint128_t) x7 * x12;
 uint128_t x18 = (uint128_t) x9 * x7 + (uint128_t) x10 * x8 + (uint128_t) x6 * x6;
 uint64_t x19 = (uint64_t) (x14 >> 0x33);
 uint64_t x20 = (uint64_t) x14 & 0x7ffffffffffff;
 uint128_t x21 = x19 + x15;
 uint64_t x22 = (uint64_t) (x21 >> 0x33);
 uint64_t x23 = (uint64_t) x21 & 0x7ffffffffffff;
 uint128_t x24 = x22 + x16;
 uint64_t x25 = (uint64_t) (x24 >> 0x33);
 uint64_t x26 = (uint64_t) x24 & 0x7ffffffffffff;
 uint128_t x27 = x25 + x17;
 uint64_t x28 = (uint64_t) (x27 >> 0x33);
 uint64_t x29 = (uint64_t) x27 & 0x7ffffffffffff;
 uint128_t x30 = x28 + x18;
 uint64_t x31 = (uint64_t) (x30 >> 0x33);
 uint64_t x32 = (uint64_t) x30 & 0x7ffffffffffff;
 uint64_t x33 = x20 + 0x13 * x31;
 uint64_t x34 = x33 >> 0x33;
 uint64_t x35 = x33 & 0x7ffffffffffff;
 uint64_t x36 = x34 + x23;
 uint64_t x37 = x36 >> 0x33;
 uint64_t x38 = x36 & 0x7ffffffffffff;
 return (Return x32, Return x29, x37 + x26, Return x38, Return x35))
x
     : word64 * word64 * word64 * word64 * word64 → ReturnType (uint64_t * uint64_t * uint64_t * uint64_t * uint64_t)